Thailand uses the Buddhist era date system, 543 years ahead of the Gregorian calendar, so that the Gregorian year 2007 is 2550 in the Thai calendar. The format, used for both the Gregorian and the Thai date systems, is:

The postal code may also be written immediately following the province name.

Addresses are often based on the Thai sub-divisions and are numbered. Provinces (Changwat) are broken down into districts (Khet and Amphoe), broken down into sub-districts (Tambon), broken down into villages (Moo Ban, Ban or Muang) broken down into neighbourhoods (Moo). A soi is a side street branching off of a main street (thanon). They are numbered and include the name of the main street:

Soi Sukhumvit 4

meaning the 4th side street along Sukhumvit thoroughfare. One side of the street contains even numbered soi, the other side odd numbered. If streets are added, for example between sois 7 and 9 it will become soi 7/1. Buildings are numbered in the same way

Postal codes consist of a block of 5 digits, commencing with a number between 1 and 9. The first two digits of the postal code indicate the province, the last three the post office. A postal code ending in ‘000’ indicates an “important” centre, postal codes ending in ‘0’ indicates a delivery office.

There are currently no codes commencing: 19, 28-29, 59, 68-69, 78-79, 87-89, 97-99.